Henry c



(No Model.)

H. G. RASNER.

VISE.

Patented Apr. 19

- ilnrrnn entr es"rinse;

- the nut, and

1 but being only in one portion.

..rricr HENRY enAsNER, or sen FRANCISCO, CALIFORNIA.

vies.

SPECIFICATION forming part of Letters Patent No. 473,343, dated April 19, 1892.

Application filed January 27, 1890. Serial No. 338,274. (No model.

.[0 all whom it may concern.

Be it known that I, HENRY O. RAsNEn, a citizen of the United States, residing in the city and county of San Francisco, State of California, have invented an Improvement in "ises; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to that class of: vises in which a segmental or mutilated screw engages a corresponding nut, whereby when the screw is turned to one position it is free of the nut,-and the movable jaw of the vise maybe rapidly moved in or out to approximate position, and when the screw is turned in another position it will engage the nut, and will thereby tighten up the movable jaw on the work.

The object of my invention is to provide a simple form and construction of this class of Vises, the general advantage of which is Well known-namely, the capacity of being rapidly set to approximate position and then tightened on the work instead of being slowly set up, as by the ordinary power-screw.

25 Q My invention consists in the novel constructions and combinations hereinafter fully described, and specifically pointed out in the claim.

Referring to the accompanying drawings fora more complete explanation of my invention, Figure 1 is a vertical longitudinal section of the jaws of my vise, the screw being in elevation. Fig. 2 is a bottom viewof my vise. Fig. 3 is across-section through nut B and sockets C. Fig. dis a longitudinal section of nut 13 and elevation of screw F to show the hevels of the thread ends.

A is a plate, which forms the fixed jaws of the vise and may be securedliirany suitable manner to a bench or block, as may he desired. To the lower end of this plate is firmly secured a nut B, Which-is internally -threaded, its threads, however, being only partialwat is to say, it is'a segmental or mutilated nut, its threads not extending all the way around (IIere shown as the upper portion.)

0 are suitable rod-guides on, each side of preferably cast or formed with the fixed jaw.

D is the movable jaw of the vise. Secured to and'extending from this jaw are the guidewhereby the jaw is supported and guided.

F is the operating-screw oi the vise. The outer end of this screw passes through the movable jaw I), and is so seated therein as to rods E, which pass through the rod-guides C,

rotate freely, not, however, being threaded iii 1 it or in any nut carried fby'it, as 'is custom: ary, but freely journaled in it, being held therein by jlanges or collars on each side. The head of the screw is provided with the usual hand-lever G, and its rotation is limited and defined by a small lug fon the screwhead, which is adapted to come in contact with a fixed stop-lug (Z on the movable jaw.

The screw .1 is not a perfect one, but its threads, as shown, are only partial-thatis to say, do not extend wholly around the screw. The screw is therefore a segmental or mntilated one, having threads on one side auda smooth portion on the other-side. The screw passes through the nut E, as shown.

The operation of the device is as follows: hen it is desired to rapidly move the slidmate position, the screw is so turned as to carry ts threads out of engagement with the threads of the nut, bringing its smooth portion opposite said threads, thisportion being defined by the contact of the lug f with the stop (Z. In this position the screw is entirely free of the not, and. the sliding jaw may be rapidly and easily moved to approximate position to receive the work and to bear upon it. Nowto tighten the movable jaw on the work, the screw is turned back again so that its threads engage the nut, and as the engagement takes place the screw is fed forwardly, thereby tightening the jaw on the work. There is one dil'ficulty to be encountered and overcome in this form of construetionnamely, the avoidance of an abutting contact between the endsof the threads on the screw and the ends of the threads in the nut when the screw is turned to itsengagement. It will readily be seen that when the'movable jaw is moved to approximate position it may so happen that the ends of-the two threads may be directly opposite ea ch other, and willcome into positive contact and prevent the screw from engaging the nut. Now to avoid this I bevel or incline the end of each thread on the screw, as shown at EU, on its inner side, and I correspondingly bevel the adjacent end of the thread of the nut, as shown at m. Now the effect of this is that when the screw is turned to its engagement witlrthe nut, these two bevels, engaging each other, throw the screw outwardly or backwardly onto the next thread of the nut before the engagement becomes perfect and the tightening takes place. If the bevels were on the other sides of the threads, the tightening would take place immediately, and the movable jaw would be set up on the work before the full engagement of the threads took place; but by putting the bevels on the side I have shown the screw is thrown baekwardly onto the next thread, so that it has room to tighten or close in again upon the full engagement of the threads.

I am aware that in vises of this class segmental or mutilated screws have engaged corresponding nuts, whereby the movable jaw might be rapidly slid in and out to approximate position; but in such cases it is common to etlfcct the tightening by threading the screw in the movable jaw or in the nut carried thereby. I do not therefore claim, broadly, the engagement of a seg nental screw with a corresponding nut; but

\Vhat I do claim as new, and desire to secure by Letters Patent, is

In a vise, the combination of a fixed jaw, a movable jaw, a nut in the fixed jawhaving a mutilated thread, an operating-screw carried by the movable jaw, having, also, a mutilated thread, the ends of both the threads onthe 

